Screening-machine for paper-pulp.



B. D. GOPPAGE.

SCREENING MACHINE FOR PAPER PULP.

APPLICATION FILED Nov. 9, 1911.

BENJAMIN DENVER COPIAGE, DF WILMINGTON, DELAWARE.

SCREENING-MACHINE FOR PAPER-PULP.

Specioation ot'Letters Patent.

Application led November 9, 1911. Serial No. 659,810.

The present invention is an improvement in screens for paper pulp stock, and particularly is an improvement in devices of this kind in which the screen is of cylindrical form and provided with a conveyer for feeding the stock longitudinally therethrough.

The objects of the invention are to provide a durable and. ecient screen or separator of large capacity in which the course particlesof the pulp stock will be rapidly passed longitudinally through the screen, the fine particles passing transversely out of the screen through the openings therein. The invention will be better understood by reference to the accompanying drawing which is alongitudinal sectional View, partly-in elevation, of an improved device. Referring to the drawing, 1 is the main frame or base of the machine resting upon a suitable foundation of concrete or other material. At opposite ends this base has trough-like inclined walls 2 and 3, leading respectively to discharge openings 4 and 5. Secured on this base, as by means of bolts passing through contacting lips or anges, is .a semi-circular removable cap, the end portions 6 and 7 of which are trough-like or V-shape in cross section, and

form continuations of similarly shaped portions of the wall of the base 1 and of the troughv like walls 2 and 3, these walls of the base together with the end portions of the cap forming annular trough-like chambers l8 and 9 having the discharge openings 4 and 5 heretofore referred to. The central portion 10 of the cap serves with the main frame particularly to inclose the support-ing bearings for the screen or separator and the parts ,associated therewith, hereinafter to be referred to.

. At the intake en'd of the machine, there is a hopper or chute 1 1 which is secured to the frame or base in any suitable or de- Sired manner. A water supply pipe 12 tapped' into an opening in the endwall of said hopper serves tojdeliver therein a jet of .water having suilicient pressure to Vwash into the'screen or separator-any particles of pulp` which might collect on the bottom of theJ hopper. At the discharge end of the machme, there is a. downwardly opening hood 13 bolted or otherwise secured to the base 1 and the semi-circular cap. From the hopper 11 the material is delivered into the open end of a rotatable perforated or foraminated screen, drum or cylinder, which for convenience is herein 4designated the rotor 2. This rotor is made up of a heavy outer cylindrical shellA 14, preferably of brass, and an inner closely tting lighter cylindrical shell 15, preferablyl of brass or steel. Those portions of the opp'ositefends of the shell 14 which 'are surroundedby the annular chambers 8 .and .9 are perforated with relatively. large openings. CorrespondinY portions of the walls of the inner shel 15 are also perforated with slots or openings registering with the holes in the outer shell. The holes of the outer shell are preferably larger than those in the inner shell. The slots or perforations in the inner shell 15 are preferably arranged in regular annular serles.

About the middle of the rotor, there is a sleeve or annular band constituting a hub 16 carrying two symmetrically positioned heavy flanges 17 and 18 constituting iy wheels, A driving belt 19, passed up from beneath the machine around the hub 16 between the Bauges 17 and 18, serves to drive the rotor, the driving power thus being applied .at the middle of .the rotor in. ,symmetrical relationship toits ends.. Suitable driving connections other than. a belt. 'may be employed if desired. The rotor-,is .supported in any `suitable manner, preferably by two bearing elements, here shown as ballbearings 2() and 21. Encircling and xed Patented Sept. 3, 1912.

to the shell 14 of the rotor, within the .chambers 8 and 9, there are provided flanges 22 and 23 said flanges being flared toward each ,other and conforming to ,the inclination of the adjacent walls .of .said chambers. As shown, these anges overhang certain of the .perforations in the rotor and hence when the machine isin operation, they willdetlect toward the. deeper portions ofthe two chambers Sand 9 the fine pulp which is screened .through the rotor. Each chamber 8 and 9 may be provided -with a water inlet pipe 24 to each of which a suitable nozzle 25 1s secured. Extending centrally and longitudinally through said rotor or screen 1s a core 26, the opposite reduced ends ofl which ejected are respectiyely secured in openin in the end wa ls of the hopper 11 and ood 13. This core is perforated, and is lconnected with a pi e 27 leading tofa suitablewater suppl n this core there is mounted a plurality of nozzles or jets 28, the dis-A charge ends of these nozzles orjets beingV bent forward in the direction of movement of the stock. These nozzles or jets are arranged s irally of the core 26, and the water erefrom forms, therefore, a spiral water conveyer which feeds the paper pulp longitudinally throu h the screen or rotor, the line plalrticles of e pulp passing transversely t ough the slots or perforations in the screen or rotor and the coarse particles being discharged through the hood 13.

The operation ofthe device is as follows The screen or rotor being driven at the ro r speed, that is to say, about live hundre revolutions per minute, which will be low enou'gh 'to prevent centrifugal force .holding the pulp too tightly to the screen, the paper p p stock is introduced into the screen or rotor through the hopper 11. Part of the nematerial passes through the slots or perforatipns nearest to the hopper or chute and out through the discharge opening 4. The remainder of the stock is fed longitudinally of the cylinder by the spiral water conveyer, the action of the conve er in this respect being similar to that o a metal screw conveyor. More of the tine stock passes through the slots or perforations near the discharge end of the device, and the coarse stock finally passes out of the screen or rotor and through hood 13.

With devices of this character employing a solid screw conveyor, the danger of Vsome foreign substance jamming the machine and Ainterrupting'its operation is always present,

whereaswith the spiral water conveyer described, this dangeris obviated. Further,

- the life .of the improved device is much increased over one employing a solid. conve er; and, in addition, more stock can be e ectively screened in a given time because, with a waterconveyer, there is no grindingv action tending to jam up the slots or perforations, but, on the contrary, the jets of waterv which constitute the conveyor promptly wash out any stock which, unable to pass through the slots or perforations in the screen or rotor, becomes tempiarily lodged therein. The power required to drive a screen or separator of this type is not materiall different from that required to drive such evices employing a metal screw conveyer, there being no friction between the water jet conveyer and the lcylinder but only the retardation due to the inertia of the water which is thown from the orifices upon the revolving screen.

What 1s claimed 1. a screening device, the combination of .liquid supplfy 4rial actedon pass transverse] a rotatable perforated cylinder, a plurality of nozzles or jets arran d longitudinally of said c linder each o said nozzles or jets bein nt forward in the direction of travel of At e' material acted on, and a source. of connect-ed thereto whereby line particles o the material acted on pass `transversely through the perforations and coarse articlesA are carried by the water longitudinally throu hsaid cylinder.

,2;VIn a screeningevice, the combinatlon of a rotatable 1perforated cylinder, a plurality of spira y arranged nozzles or jets inclined in the dlrection of travel of the ma.

terial, acted u on, and a source of liquid supply connect thereto whereby4 fine partlcles of the material acted on pass trans'- versely through the perforations and coarse particles are carried the water longitudinally through said civ 'nden 3,"In a screening evice, the combination of' a rotatable perforated cylinder, a plurality of nozzles or jets arranged longitudinally and spirally of said cylinder inclined in the direction of travel of the material acted upon, and a source of liquid supply connected thereto whereby fine particles of the material acted on pass transversely through the perforations and coarse articles 'are carried by the water longitudinally throulglh said cylinder..

4. al screening device, the combination of a rotatable perforated cylinder, a pluralit of stationary nozzles or jets arranged longitudinally and spirally of said cylinder, and a source of liquid supply connected thereto whereby line particles of the material acted on pass transversely through the perforations and coarse particles are carried by the-water longitudinally through said cylinder.

5. In a screening device, the combination of a rotatable perforated cylinder, a plurality of nozzles or jets arranged longitudinally and spirally of said cylinder, eachof said nozzles or jets being bent forward inthe direction of travel of the material acted on, and a source of liquid supply connected thereto whereby fine particlesof the matethrough the erforations and coarse partie es are carried y the water longitudinally through said cylinder.

6. In a screening device, the combination gofra rotatable perforated cylinder, a pluv ra 1 of stationary nozzles or jets arran d longltudin'ally and spirally of said cylin er, eachof said nozzles or jets being bent forward in the direction of travel of the material acted on, and a source of liquid su ply connected thereto whereby fine' particles'fof the material -acted on pass' Tf transversely through the perforations and coarse parti:

cles are carried by the water-'longitudinally throughsaid cylinder". l

7. In a device of the character described, the combination of a rotatable perforated cylinder, ahollow stationary shaft passing through said cylinder, a plurality of nozzles or jets arranged longitudi nally and spirally of said cylinder, and 'a source of llquid supply connected thereto whereby fine particles of the material acted on pass transversely through the perforations and coarse particles are carried lby the 10 Water longitudinally through said cylinder.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' i BENJAMIN DENVER COPPAGE. Witnesses:-

JOSEPH D. THOMAS, GEORGE L. COPPAGE. 

